Rate: 90 – 120 PLN/hour (B2B)
We are looking for an experienced Software Engineer to join Flix on a freelance/service agreement basis (B2B contract). This is a contractor engagement for a seasoned engineer who wants to work on impactful, hands-on engineering challenges.
Scope of Services
Build and scale the customer service platform that handles millions of passenger conversations across markets — from AI-powered chatbots and voice agents to help center and knowledge base tools. We run a polyglot stack (Python, TypeScript, Terraform) on AWS, integrating Twilio, Cognigy, Kafka and AWS Bedrock. We ship continuously and own our services end-to-end, from Terraform to production.
About the Engagement
- Design, build and maintain Python (FastAPI) backend services and TypeScript/React frontends across the CS platform
- Take greenfield products from concept to production — make architectural calls, prototype, validate, and iterate under uncertainty
- Develop and extend Twilio Functions (JavaScript) for voice/IVR and webchat flows
- Manage the infrastructure as code with Terraform (HCL) on AWS — you build it & deploy it
- Integrate third-party and AI platforms: AWS Bedrock, Twilio, Cognigy, LiteLLM, Kafka
- Apply AI to your engineering practice — use and help improve our internal AI tooling to ship faster and raise quality
- Instrument and monitor services (Datadog, event forwarding, alerting) and respond to production issues
About You
- 2–4 years building production software
- Strong in Python (FastAPI or similar) and comfortable in TypeScript/JavaScript (React a plus)
- Hands-on with AWS and infrastructure-as-code (Terraform)
- Solid Git workflow, CI/CD, and containerized services (Docker)
- Strong ability to navigate vague or shifting requirements — a bias for action, comfort making decisions with incomplete information, and the judgment to avoid analysis-paralysis
- Pragmatic, ships iteratively, communicates clearly
- Curious about and comfortable working with AI tooling in day-to-day development
Preferred Skills:
- Experience building products from scratch (0→1) in a fast-moving team
- Conversational AI / chatbot / IVR experience (Twilio, Cognigy, DialogFlow)
- LLM / GenAI integration (Bedrock, RAG, MCP servers)
- Event streaming (Kafka) and observability (Datadog)
- Customer-service or contact-center domain exposure
Collaboration Model
- Cooperation based on a service agreement (B2B/freelance contract), not an employment contract
- You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices
- Location: open for contractors based in Poland
Skills Required
- 2-4 years building production software
- Strong Python skills, preferably with FastAPI or a similar framework
- Comfortable with TypeScript and JavaScript
- React experience
- Hands-on AWS experience
- Infrastructure-as-code experience with Terraform
- Experience with Git workflows, CI/CD, and Dockerized services
- Ability to work with vague or shifting requirements and make decisions independently
- Clear communication and pragmatic, iterative delivery approach
- Comfort working with AI tooling in day-to-day development
- Experience building products from scratch in a fast-moving team
- Conversational AI, chatbot, or IVR experience
- LLM or generative AI integration experience
- Event streaming and observability experience, including Kafka or Datadog
- Customer-service or contact-center domain experience
- Ability to work as an independent contractor based in Poland under a B2B service agreement
What We Do
Flix is a global travel tech leader providing sustainable and affordable travel options to more than 60 million yearly travelers in 43 countries through its brands FlixBus, FlixTrain, Greyhound, and Kamil Koç. By combining network planning, marketing, and pricing, Flix uses innovative solutions to enable comfortable, sustainable, and affordable travel worldwide. Through our tech platform and user-friendly app, Flix creates a travel experience tailored to passengers' needs and connects travelers with local business partners providing transportation, ensuring a modern fleet that adheres to the highest safety standards. This asset-light business model has turned a European start-up into a leading and globally expanding travel-tech champion. Flix is pioneering and testing alternative drives with a long-term strategy to progressively decarbonize its fleet. Together with our partners and customers, we are driving transformative change towards the future of mobility, gradually reshaping the mobility sector and enabling more sustainable travel modes. Check out https://flix.careers/ to see how you can join our team. For our legal imprint click here: https://global.flixbus.com/legal-notice
